Shock absorber



Oct. 6, 1931. M. P. RUMNEY SHOCK ABSORBEH Filed NOVY l, 1928 3Sheets-Sheet l INVE NTO R Mason .Pi/@M2767 Oct. 6,'1931. M. P. RUMNEYSHOCK ABSORBER Filed Nov. 1, 192s 3 Sheefs-Sheet 2 INVENTOR ATTORNEYSOct. 6, 1931.

M. P. RUMNEY SHOCK ABSORBER Filed Nov. 1, 1928 5 sheets-sheet 5 ATTO RNEY-s fac ' Patented"V Otffi, 1931 1 STATES PATENT i oFFlcE y Y 'l MASONI. RUIINEIOF DETROIT, MICHIGAN, AssIeNoRTo DETROIT STEEL PRODUCTSCOMPANY, DETROIT, MICHIGAN, CORPORATION-CF MICHIGAN snoek ABsoBBEn iApplication mea November 1f, wat.` serial No. aimes; f

Y f "-'li'her'invention relates to` shock absorbers Y 4 vand isparticularlyapplicable to shock ab-y -sorbers for vehicleleaf springs.One of the Objects of the invention is to provide a shock fabsorberwhich vwill not affect the operation ofthe spring to, which itis applied during :the movement ofthe vehicle over a fairly smooth road,but will automatically increase f the resistanceto flexure ofthe springduring the movement off the vehicle over a `rough iroad. Another objectis to provide asimple construction ofshock absorberwhich maybe readily@applied. Further objects of the inventionfreside in'fthe'novel featuresof construction and combinationjand arrangements of parts vas more fullyhereinafter set forth. I In the drawings:`

l, Figure l1is a side elevation of ya shock absorber, embodying myinvention, and show- 20 ingthe same applied to a vehicle leaf spring ;V

Figure 2 isy an end view thereof;

Y Figure Sis a cross section on the line 3&3

ofFigure2; 'i

' Figure 4 is a'view similar tokFigure l ,showing a modification; v 1-gf-Figuren is a bottom plan viewfthereof;

EFigureris avie'w similar toyFigure l, showing!anotherfmodification;

Figure V7 A's atop` plan view thereofg f VFigures 8 and 9v areviews-similar to Figure 15 showing further modifications.

While'the Vshock ,absorberlembodying m vvi'nventionfis applicableto'diferent types of Yleaf springs,'fit is'shown in the'present in- -amotor vehicle. "Thisspring is represented i.' by the referencecharacter`l and is formed p in the usual manner of .the mainspring-leaf 2 V,andthe'complemental'spring'leaves 3.y This Y i yspring extends transverselyof and is rigidly j secured intermediate its'ends to the axle '4'. I'preferably provide a shockabsorbing dejivice at' each end'ofthe'springand since theseV devices are s1m1lar,but one will .be described.

5is the frameof the device having V-shaped `A arms'at thelinner andouter. `sides ofthe Y spring and connected together at their inner endsbythe bar 7, which is preferably'integrall with the arms. This framecarries con- Y tact bearings for engaging one side of the stance vasapplied to a-semi-elliptic spring of spring at longitudinally spacedpoints and an intermediate contact bearing for engaging 'the oppositesid'enof the spring at a longitudinally intermediate point. One of thecontact bearings is a set lscrew 8, which isthreaded through the har 7and is'adapted to abut'one lof the spring leaves. Another contactbearing is the roll 9 which extends between the arms 6 at their a-picesand is adapted to 'abut another spring leaf. The other contact bearing"for abutting a spring leaf at' the same side of the spring as thesetscrew 8 is the cam 10,*w'hich is journaled in the outer ends of thearms 6 and extends therebetween. In the presenty instance the .set screw8 and the cam l0 are shown abutting a convex side of the springanddifferent .complemental spring leaves 3 with the roll 9 abutting theconcave side of the spring and the main spring leaf 2. The set screw canbe tightened down to vclamp 'the spring leaves between thecontactbearings with an predetermined pressure and the end'of thev setscrew ispreferably made to :indent'the spring leaf which it engages to hold theshock absorbingdevice from longitudinal movement relativeto this springleaf.

The cam 10 isformed with the arcuate portion' l'l'which is concentricwith the axis of rotationof the -cam and with the cam portions Vl2 onopposite'sides of and adjacent to the arcuateportion 11.` For rotatingthe cam uponA flexure of the spring, I have provided the lever 13whic'h5 as shown, is rvbifurcated with the outer endsof its bifurcationsfixedly securedrto the endsof the camas by means of t'hels'et screws144;. The lower end of this lever is pivotally connected to the outerend vof the `actuating rod,15,lthe inner end of the actuatingl rodloeingfpivotallyv vconnected to the clamp q*16 upon the axle'4.

For facilitating'f the application lof both devices and their camactuating mechanism,

'clamp' 16 is formed of the cooperating clamp `sections 17 7.which havehooks l8at their upper ends for engaging over the lower flange *of theaxle 4, this axle in the Vpresent instance .being an I-beam. Theseclamping sections are. secured together attheir lower ends by means 'ofthe bolt'19 andthe nut 20.

Theicam lfoccupies a position such that l absorb thefshocl:Inadditiomthearrange;

its arcuate,portiony 11 is in contact with thev spring' Vduringordinaryflexure of thespring while the' motor' vehicle. 1s travelingover a vfairly smooth'road'so that the shock absorbing device has'noappreciable effect upon the springfatpthis time. 'However,upon fiexureof thaspring beyond the ordinary or normal iieXure" when the motorvehicle istraveling over a rough .road the flexing of the spring ineither directioncausesrotation ofthecam v'- y, through the-actuating rod'15 t'obr'ing one@ of the cam portionsl2 of thev cam into` engagementvwith kthe springftherebyfmor'e tishtlv Clamping the rprtefrofgth@Spring embracedbetween the contact bearings of the l fdeviceandincreasing the frictional resistance t0 relativemovement'of the`springlleaves to 'mentflofthe device itself is suc-h kthatdownwardmovemient oftheendilof the spring'rela-Y tivejto; its pointof.,connection lto Vthe axle .causes .increased pressure between thespring leaves;k Y

In .themodificationshown'in vFigures 4 and .5, tliecshock absorb-ingdevice has its frame V2l.forniedofthesheet.metal'plate 22 and lthe'.a-rms123 extending integral from the side :edges of-the'y'plateintermediate its ends. As shown, thefplate isbelow the spring 241 andthe arms extendupwardlyadjacentto the inner and outer` sidesof thisspring. `25gis a lcontact*bearing in the nature of a set screw-threadedlyv engaging oneend of the .plate 22 vandabutting the lower orconvex side of the 'springe n265is'a second Contact bearing in f .the'nature/.of-A roll engf'iging the upper or concave'fsi'de of the springand extending lbetv'veen the arms 23.; `27 is a third Contact f4bearingat'tl 1'e oppsiteend'of the plate and in l:the n'atnreof. a camfor engagingr the] lower for convex side ofthe spring. This thirdcontact bearingis formedin the` same manner 'ias the Contactbearing10-and is secured tothe 4yoke 128 vvvhichldepends therefrom.vv@The lower Y iportionfof'thisvokeis connected to an outer Y endof-thefauxiliary spring leaf 29, the inid-V ldleof whichzis rigidlysecured betweenthe 'i formed of.rubbergclampedbetween the llower end ofthe lever and the lauxiliary spring leaf; .This shoclnabsorber operatesin substantially spring and .the axle. To provide .forswivel yaction andat the Sametime eliminate noise, there is the resilient-blockBO'Vpreferab'ly the lsamemanner asgtliat shown in Figureszl,

`" V2 .and i3 with a possible 'exception` that the,

auxiliaryfsnri-ng leaf mavlfiex slightly upon 4flexing of the vehiclespringso tliatjthe rotanounce'd.` l 1 g -Intheimodlficatlon shown inFigures 6 and Vthey frame of the shock absorbingY device prisVformed-inthe sameimanner as that of 'the shock;A absorbing device 2l.'Howeven in# stead ofthe cam'being locatedbelow the spring and4 at: oneend ofthe plate, this' cam is l journaledin theparms `31 andy contacts,with

the upper or concave side of the spring, the

lcontactbearings atthe lower or convex Vside of the spring being theroll 32-at one end.l of

the plate andthe set screwr33 at the other end. i Thecain is actuatedby'means of therod 34 which at Yone ,end is pivotally rconnected t0 theleverf secured to the"l0am *and* at 'the othery end to thebracketclamp'ed tok the middle of? un; Spring. nessi-eat blacks 3 7preferably formed of vr'ubberare provided between the rodand the leverand bracket. fl y In the'modiiication shown in Figure 8,-Ythe Yconstruction of! 'the shock absorbing z device 38 is: the samev as thatshown in Figures 4 andfi :but the cam39 is actuated;` from thevehiclerframe. `More .particularly, this lcam vehicle frame havingsecured; thereto the bracket 43 whichis pivotallyconnected to the rod41. InA operation,lv this shock absorbing shown in'liiguresl. 2 and 3. l"a 'device functions Vinthe-same mannerv as that end of the ca1n45extends fromthis; caml ina direction sucht-hat uponitlexing ofthe springthe cam is automaticallyiturned*by mea'nsoffL the rod46co1mectedto the'vmotor vehicleside sill in'V the direction takenxbythe corn-ple-` mentalspr-ing lea-'ffY Y As sho'wn,-tliisle-ver ex- `Vtends away fromthegmiddle ofthespring. 4

'Asga result ofthis constructiorn'the:frictioni` between thecam andthespring leaf'is minimized'. Whatl claim as'my inventionis': -A

-1.:The Acombination with a vehiclefleaf spring. of a shock ,absorberYtherefor having .contact bearing means for engaging one Yside f vof vsaidvv spring. Y at alongitudinallyf spaced Figure-9 disclosesamodificationfof A 8 in whichthelever 44'iXedly-secured to yone Yjtlfieffree vend of whichisj pivotally connected I to thev rod *41.Y 42is a sideysill?f-thegimotor:

pOlnts, Contact bearingmeans 'wforf'fengagi'ng V the .opposite-sideA ofsaid jspring at longi-A tudinally"intermediate point,l oneoffsaidcontact bearing: meansl including al cam having thereof,A ofvshock absorbing. :means for.v said kspring comprising devices"V` near nthel Aends thereof. each ldevice havingfc'ontactbearing 2 "means forengaging one side ofsaid springat longitudinallyspaced points,vandfcontactVV bearing'ni/ilus 'for engaging the oppositeside of saidspring'at a longitudinally intermedi- -ate Tpoint', one; of Ysaidy"contact bearing Ameans Vincluding a cam, vrods connected at theirouter vends to ,the cams'ofboth devices,y and a clamp ilo l upon saidaxle and connected ends of said rods.

to thek inner *TheV combination with alvehicle leaf spring, of a shockabsorber therefor having Contact bearing means for engaging one side ofsaid spring at longitudinally spaced points,l Contact bearing means forengaging the opposite side of said spring at a longitudinallyintermediate point, one' of said contact bearing means including a cam,and means for rotating said cani to increase the friction between thespring leaves upon flexure of said spring, said means includinga memberhaving aportion stationary with" respect to said spring, a lever securedto saidcamand ineinber, and resilient means clamped between said leverand member.

4. The combination With ay vehicle leaf spring, of ashock absorbertherefor having contact bearing means for engaging oppositel sidesofsaid spring, one of said contact bear- Y ing means including acam'having an arcuate portion concentric With the axis of rotation ofsaid cam for engaging saidspring during its normal flexure and alsohaving a cam portion Or'engaging said spring uponflexure thereof beyondnormal, and'means including a member having ,a portion stationary withrespect to said spring anda lever secured to 50 said cam and member forrotating said cani f upon lexure of said spring.

, In testimony whereof I aii'ix my si gnature.

MASON P. RUMNEY.

